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Thread: Tamron 150-600mm VC

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    Super Moderator NEF.D90's Avatar
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    Tamron 150-600mm VC

    I keep thinking about and researching this lens.
    Such a good price on a lens that is really good quality for a super zoom.

    I do have a question regarding the 600mm focal length, is 600mm basically a 100% crop of a 300mm?
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    Administrator Aloicious's Avatar
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    I've seen some awesome shots from the tammy 150-600

    I'm not sure I understand the question about the cropping
    -Justin

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    Super Moderator NEF.D90's Avatar
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    If I wanted to get and idea of what a 600mm focal length would look like, could I just do a 100% crop on one of my photos @ 300mm?
    Right that should let me see how tight the frame would be on said shot if I had been using a 600mm.
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    Administrator Aloicious's Avatar
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    oh I gotcha, just kindof a comparison of the field of view you'd get on 600mm...so not really 100%. that's just pixel for pixel, what you'll want to do is calculate the (I hate this term, but for lack of a better one at the moment) """crop factor""" to determine how much to crop to get a comparative field of view.

    So if you're using 300mm on an FX sized sensor, on your D600 you're getting full sized images that are 6016x4016, you would want to crop the image down to a 3008x2008 px size, this would be a 2x factor and would basically give you the field of view of what a 600mm lens would cover on the whole sensor (remember that the 600mm image will cover the entire sensor so it will give more fine details than the cropped version of the 300mm image will have, and further cropping will still be possible too)
    -Justin

    Bodies - D800E
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    Super Moderator NEF.D90's Avatar
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    Oh ok. So a 1:1 zoom On lightroom might not be 3000x2000pxl? I'll check it out tonight.
    I'm really considering getting one of these lenses. I just want a super zoom for my wildlife photos.
    Every time I shoot small wild life is just yearn for a longer lens.
    If your going to dream, Dream Big!

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    Administrator Aloicious's Avatar
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    yeah that's correct. 100% crop or 1:1 zoom is simply that each screen pixel is a camera pixel so you're viewing it at full size that the camera captured, so what you're able to fit on screen when viewing 1:1 will depend on the resolution of your screen. if you want to compare field of views from a crop, you'll need to specifically crop to that size and toggle back and forth from full frame to the cropped version (both expanded to to same view able screen size)...the reason we want 3008x2008 is because that is a 2x """crop factor"""

    I could guide you on how to do that in PS, but not in LR since I almost never use LR so I'm not familiar with the navigation of it.
    -Justin

    Bodies - D800E
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    Super Moderator NEF.D90's Avatar
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    Right on, I'll check it out for sure abs then maybe post on how to do it.

    I would presume that the tamron is going to be slightly better optical quality than my 300mm F4.0-5.6, simply because of the technology available now vs. 8 years ago.
    What do you think?
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    Administrator Aloicious's Avatar
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    your 70-300 is the older non-VR version right? if so the tammy will be probably at least good or slightly better than the 70-300 @ 150-300mm, but the tammy will be significantly better in terms of IQ from 300-600mm vs the 300+ a heavy crop. Plus with the tammy, you can shoot at 600mm, and still crop some and be able to maintain a decent IQ, which will come in really handy for wildlife.

    remember though that the tammy is only f6.3 wide open when zoomed all the way in, it shouldn't be a problem in good lighting, but when you get into darker lighting, that's where it'll struggle more.
    -Justin

    Bodies - D800E
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    That's one good thing, I'm going from 5.6 (which I only shoot @ F8 due to the horrible CA @5.6) to a 600mm F6.3. (which I'll also be shooting at F8 for the added sharpness)
    I would rather shoot 300mm 1/400 at F8 ISO 3500 than 5.6 @ ISO 1000. That make sense?
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    yeah, that early 70-300 had a history of bad CA like that. I totally understand, on the tammy you'll be far better shooting at F8 pretty much across the board, and F6.3 should even be usable, though there will probably be a dropoff in corner to corner sharpness wide open like that but it should perform better at f6.3 than the 70-300 did at the same aperture.
    -Justin

    Bodies - D800E
    Lenses - Sigma 18-35 f1.8 DC | Zeiss 15mm f2.8 ZF.2 | Zeiss 21mm f2.8 ZF.2 | Sigma 35mm f1.4 Art | 105mm f2.5 AI-S | 70-200 f2.8G VRII | 200mm F4.0D Micro AF | 300mm f2.8 VRII

    My PhotographyWild Blog

    C&C is always welcome on the images I post.
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